docs: def post(self, id):
          '''Follow an object given its ID'''
          model = self.model.objects.only('id').get_or_404(id=id)
          follow, created = Follow.objects.get_or_create(
              follower=current_user.id, following=model, until=None)
          count = Follow.objects.followers(model).count()
          if not current_app.config['TESTING']:
              tracking.send_signal(on_new_follow, request, current_user)
          return {'followers': count}, 201 if created else 200